I didn't hear about this Jacqi Smith case, I'll have to look it up.

On Mythbusters, they did a segment on defeating fingerprint locks. They copied the print, scanned it, and found that a printed copy (scaled properly) didn't work. So they enlarged the print and used a felt tip marker to fill in the voids that the lifting process lost. Scanned it again, printed at proper scale, and the paper copy of the print worked just fine.

Fingerprint matching is an interesting process. The Federal system spits out 6-8 matches and near matches, then a certified fingerprint technician does a match between the crime scene print and the ones provided by the computer, then further identification can be made. So you're not going to be convicted on a computer match, a person must do it and can be cross-examined in court.

It is quite a problem. I saw a piece this morning on Slashdot (IIRC) saying that scents are unique per person and don't change based on diet. I'm not sure I buy that, it'll be interesting to read further on it.